<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>欢迎回来，管理员！</title>
</head>
<body>
<a href="addbook.html"><button>添加图书</button></a>
<a href="updatebook.html"><button>更新图书</button></a>
<a href="deletebook.html"><button>删除图书</button></a>
</body>
</html>